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(3/5)*x+4/5 = 31/5 // - 31/5
(3/5)*x+4/5-(31/5) = 0
(3/5)*x+4/5-31/5 = 0
3/5*x-27/5 = 0 // + 27/5
3/5*x = 27/5 // : 3/5
x = 27/5/3/5
x = 9
x = 9
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